For over the last decade, Caroline Wozniacki has been one of the mainstays of the WTA Tour. Just like Maria Sharapova, Serena Williams and Angelique Kerber, it's hard to imagine the tour without the Danish player on it.

On Friday, the 29-year-old announced that the 2020 Australian Open will be her final tournament. With 30 titles, 71 weeks world No. 1, and a Grand Slam title on her resume, Wozniacki has accomplished almost the very best that a player can hope to do.